The Bloodstone of Targun is a mystical, magical stone, revered for its life-enhancing properties. The party has been asked to get it back out of the Mirefen bog. However, the local frog people have decided they don't exactly want to give it up. That's the story behind Descent into Mirefen, a new RPG adventure for 5th edition that's up on Kickstarter now.

From the campaign:

An original level 5-7 adventure made for D&D 5e: Within Mirefen’s bog is a ruined temple. What horrific magic wends through the waters?

Descent into Mirefen is a Menagerie Press D&D 5e (fifth edition) RPG adventure. The adventurers journey into Mirefen to retrieve the Bloodstone of Targun from a sunken temple. Unfortunately, Mirefen’s toad folk revere this glowing gem for its life-enhancing properties. The shrine is protected by both this amphibian tribe and mutant beasts created by the stone’s magical aura.

The campaign's a bit more than 4/5 of the way to its goal with 21 days left to go.